Of course, no one should stay in a bad marriage, but...
A couple need to work at it.
A marriage is a partnership forming the nucleus of a family. If there are children, they are a product of the marriage. Their welfare take precedence over the needs of the parents. A couple should work together to save the marriage, to make the relationship more important than any other thing of value. Both partners cannot be the dominant leader. One must submit to the other. The leader in turn must take responsibility for the decisions made for the benefit of the family.
In the context of traditional marriage, husbands should be the wise counselor and primary provider, and wives should be faithful and supportive of their husbands. This is the most stable of relationships with the greatest chance for success, and the safest and most psychologically healthy environment for children and their parents.
RE: Why Is Divorce Better Than An Agonizing Relation?